Just ran across a question stem that asks, "Which one of the following is an assumption the argument requires in order for its conclusion to be properly drawn?"

Is this a necessary assumption or a sufficient assumption ("Justify the Conclusion") question?

Even though in this question, the distinction doesn't really matter (there's only one feasible answer choice either way), I just wanted to clarify in case there are situations where the distinction between the two would be the key to determining which is correct among two choices.